Question

A takes 40 mins. to do a job. B takes 1hr to do the same job. A,B and C start doing that job together. They complete it in only 15 mins. Had C been alone how much time would he have taken to do that job.
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Answer 1

Answer:

a - 40 min , b - 1hr , total time = 15min , c 40 min , hope it will help you